mirror of
https://github.com/python/cpython.git
synced 2025-08-02 08:02:56 +00:00
Modulefinder now handles absolute and relative imports, including
tests. Will backport to release25-maint.
This commit is contained in:
Thomas Heller
parent
df08f0b9a0
commit
112d1a64ac
3 changed files with 377 additions and 37 deletions
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@ -1,13 +1,14 @@
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"""Find modules used by a script, using introspection."""
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# This module should be kept compatible with Python 2.2, see PEP 291.
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from __future__ import generators
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import dis
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import imp
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import marshal
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import os
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import sys
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import new
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import struct
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if hasattr(sys.__stdout__, "newlines"):
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READ_MODE = "U" # universal line endings
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@ -15,11 +16,12 @@ else:
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# remain compatible with Python < 2.3
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READ_MODE = "r"
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LOAD_CONST = dis.opname.index('LOAD_CONST')
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IMPORT_NAME = dis.opname.index('IMPORT_NAME')
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STORE_NAME = dis.opname.index('STORE_NAME')
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STORE_GLOBAL = dis.opname.index('STORE_GLOBAL')
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LOAD_CONST = chr(dis.opname.index('LOAD_CONST'))
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IMPORT_NAME = chr(dis.opname.index('IMPORT_NAME'))
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STORE_NAME = chr(dis.opname.index('STORE_NAME'))
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STORE_GLOBAL = chr(dis.opname.index('STORE_GLOBAL'))
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STORE_OPS = [STORE_NAME, STORE_GLOBAL]
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HAVE_ARGUMENT = chr(dis.HAVE_ARGUMENT)
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# Modulefinder does a good job at simulating Python's, but it can not
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# handle __path__ modifications packages make at runtime. Therefore there
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@ -118,9 +120,9 @@ class ModuleFinder:
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stuff = (ext, "r", imp.PY_SOURCE)
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self.load_module(name, fp, pathname, stuff)
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def import_hook(self, name, caller=None, fromlist=None):
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self.msg(3, "import_hook", name, caller, fromlist)
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parent = self.determine_parent(caller)
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def import_hook(self, name, caller=None, fromlist=None, level=-1):
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self.msg(3, "import_hook", name, caller, fromlist, level)
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parent = self.determine_parent(caller, level=level)
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q, tail = self.find_head_package(parent, name)
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m = self.load_tail(q, tail)
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if not fromlist:
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@ -129,12 +131,26 @@ class ModuleFinder:
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self.ensure_fromlist(m, fromlist)
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return None
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def determine_parent(self, caller):
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self.msgin(4, "determine_parent", caller)
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if not caller:
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def determine_parent(self, caller, level=-1):
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self.msgin(4, "determine_parent", caller, level)
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if not caller or level == 0:
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self.msgout(4, "determine_parent -> None")
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return None
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pname = caller.__name__
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if level >= 1: # relative import
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if caller.__path__:
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level -= 1
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if level == 0:
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parent = self.modules[pname]
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assert parent is caller
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self.msgout(4, "determine_parent ->", parent)
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return parent
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if pname.count(".") < level:
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raise ImportError, "relative importpath too deep"
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pname = ".".join(pname.split(".")[:-level])
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parent = self.modules[pname]
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self.msgout(4, "determine_parent ->", parent)
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return parent
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if caller.__path__:
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parent = self.modules[pname]
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assert caller is parent
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@ -294,13 +310,13 @@ class ModuleFinder:
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self.badmodules[name] = {}
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self.badmodules[name][caller.__name__] = 1
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def _safe_import_hook(self, name, caller, fromlist):
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def _safe_import_hook(self, name, caller, fromlist, level=-1):
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# wrapper for self.import_hook() that won't raise ImportError
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if name in self.badmodules:
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self._add_badmodule(name, caller)
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return
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try:
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self.import_hook(name, caller)
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self.import_hook(name, caller, level=level)
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except ImportError, msg:
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self.msg(2, "ImportError:", str(msg))
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self._add_badmodule(name, caller)
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@ -311,38 +327,87 @@ class ModuleFinder:
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self._add_badmodule(sub, caller)
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continue
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try:
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self.import_hook(name, caller, [sub])
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self.import_hook(name, caller, [sub], level=level)
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except ImportError, msg:
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self.msg(2, "ImportError:", str(msg))
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fullname = name + "." + sub
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self._add_badmodule(fullname, caller)
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def scan_opcodes(self, co,
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unpack = struct.unpack):
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# Scan the code, and yield 'interesting' opcode combinations
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# Version for Python 2.4 and older
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code = co.co_code
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names = co.co_names
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consts = co.co_consts
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while code:
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c = code[0]
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if c in STORE_OPS:
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oparg, = unpack('<H', code[1:3])
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yield "store", (names[oparg],)
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code = code[3:]
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continue
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if c == LOAD_CONST and code[3] == IMPORT_NAME:
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oparg_1, oparg_2 = unpack('<xHxH', code[:6])
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yield "import", (consts[oparg_1], names[oparg_2])
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code = code[6:]
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continue
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if c >= HAVE_ARGUMENT:
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code = code[3:]
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else:
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code = code[1:]
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def scan_opcodes_25(self, co,
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unpack = struct.unpack):
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# Scan the code, and yield 'interesting' opcode combinations
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# Python 2.5 version (has absolute and relative imports)
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code = co.co_code
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names = co.co_names
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consts = co.co_consts
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LOAD_LOAD_AND_IMPORT = LOAD_CONST + LOAD_CONST + IMPORT_NAME
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while code:
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c = code[0]
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if c in STORE_OPS:
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oparg, = unpack('<H', code[1:3])
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yield "store", (names[oparg],)
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code = code[3:]
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continue
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if code[:9:3] == LOAD_LOAD_AND_IMPORT:
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oparg_1, oparg_2, oparg_3 = unpack('<xHxHxH', code[:9])
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level = consts[oparg_1]
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if level == -1: # normal import
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yield "import", (consts[oparg_2], names[oparg_3])
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elif level == 0: # absolute import
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yield "absolute_import", (consts[oparg_2], names[oparg_3])
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else: # relative import
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yield "relative_import", (level, consts[oparg_2], names[oparg_3])
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code = code[9:]
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continue
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if c >= HAVE_ARGUMENT:
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code = code[3:]
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else:
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code = code[1:]
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def scan_code(self, co, m):
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code = co.co_code
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n = len(code)
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i = 0
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fromlist = None
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while i < n:
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c = code[i]
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i = i+1
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op = ord(c)
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if op >= dis.HAVE_ARGUMENT:
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oparg = ord(code[i]) + ord(code[i+1])*256
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i = i+2
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if op == LOAD_CONST:
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# An IMPORT_NAME is always preceded by a LOAD_CONST, it's
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# a tuple of "from" names, or None for a regular import.
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# The tuple may contain "*" for "from <mod> import *"
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fromlist = co.co_consts[oparg]
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elif op == IMPORT_NAME:
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assert fromlist is None or type(fromlist) is tuple
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name = co.co_names[oparg]
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if sys.version_info >= (2, 5):
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scanner = self.scan_opcodes_25
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else:
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scanner = self.scan_opcodes
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for what, args in scanner(co):
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if what == "store":
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name, = args
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m.globalnames[name] = 1
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elif what in ("import", "absolute_import"):
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fromlist, name = args
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have_star = 0
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if fromlist is not None:
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if "*" in fromlist:
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have_star = 1
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fromlist = [f for f in fromlist if f != "*"]
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self._safe_import_hook(name, m, fromlist)
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if what == "absolute_import": level = 0
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else: level = -1
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self._safe_import_hook(name, m, fromlist, level=level)
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if have_star:
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# We've encountered an "import *". If it is a Python module,
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# the code has already been parsed and we can suck out the
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@ -362,10 +427,17 @@ class ModuleFinder:
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m.starimports[name] = 1
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else:
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m.starimports[name] = 1
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elif op in STORE_OPS:
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# keep track of all global names that are assigned to
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name = co.co_names[oparg]
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m.globalnames[name] = 1
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elif what == "relative_import":
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level, fromlist, name = args
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if name:
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self._safe_import_hook(name, m, fromlist, level=level)
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else:
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parent = self.determine_parent(m, level=level)
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self._safe_import_hook(parent.__name__, None, fromlist, level=0)
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else:
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# We don't expect anything else from the generator.
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raise RuntimeError(what)
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for c in co.co_consts:
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if isinstance(c, type(co)):
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self.scan_code(c, m)
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